Reversible spur for auger bits



May 6, 1924. s. D. STEADMAN REVERSIBLE SPUR FOR AUGER BITS Filed Feb.13. 1923 9S. 7 I Snow/misc Patented May 6, 1924.

UNITED STATES.

STEPHEN I). STEADMAN, OF SOUT HINGTON, CONNECTICUT.

REVERSIBLE SPUR FOR AUGER. BITS.

Application filed February 13, 1923. Serial No. 618,780.

To all whom it may concern: v

Be it known that I, STEPHEN D. STEAD- MAN, a citizen of the UnitedStates, residing at Southington, in the county of Hartford and State ofConnecticut, have invented cer tain new and useful Improvements inReversible Spurs for Auger Bits, of which the following is aspecification.

The primary object of my invention resides in the provision of areversible spur for auger bits and especially the single twist type ofauger, wherein the said spur is provided with a pair of cutting edges,the same being well adapted for ready attachment to or detachment fromthe auger for permitting either of the cutting edges of the spur to beused.

WVith the above recited objects in view,

and others of a similar nature, the inven-l tion resides in theconstruction, combina tion and arrangement of parts set forth in andfalling within the scope of the appended claim.

In the accompanying drawings:

Figure 1 is an elevational View of a single twist type of auger bit withwhich is associ ated my reversible spur.

Figure 2 is a bottom plan view of this bit, and

Figure 3 is an enlarged perspective of the bit per se.

Referring to the drawing in detail, the numeral 5 designates a singletwist anger bit of conventional type, the same consisting of the usualshank 6 and twist 7.

In adapting this type of bit for the reception of my reversible spur,the said twist 7 is formed with a vertical dove-tailed groove or slot 8directly opposite of the cutting end of the said twist 7. My reversiblespur 9 consists of a block of high speed tool steel, the opposite endsthereof being formed with cutting edges 10. The inner face of the saidspur 9 is dove-tailed as at 11 and is adapted groove 8 in the twist 7 ofthe auger bit. This spur 9 is formed with a center opening. 12 throughwhich is adapted to pass a set screw 13 the screw threaded end of thisscrew befor insertion into the said dove-tailed slot or ing receivedwithin a screw threaded opening in the twist 7 in a mannermore shown inFigure 2.

In View of the above description, it will at once be apparent thatshould one cutting edge of my spur become fdull .or chipped the saidspur may be removed from the auger and the opposite end be employed asthe cutter.

I have entered into a detailed description of the construction embracedin the present and preferred embodiment of my invention with a view toimparting a full, clear and exact understanding of the said embodiment;I do not desire, however, to be understood as confining myself to thesaid specific construction and relative arrangement of parts, inasmuchas in the future practice of my invention such changes or modificationsmay be made as fairly fall within the scope of my invention as definedby my appended claim.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is The combination with an anger bit havinga'shank and a twist extending therefrom formed with a recess inthe lowerend (por tion having dove-tailed side walls, of a reversible. spurhaving cutting edges at each end and dove-tailed side walls, said s urbeing formed with a central opening for the reception ofa screw adaptedfor threaded co-operation with an opening formed in the twist at therecessed portion thereof for removably securing'the spur within the recessed portion, whereby one end will project below the lower end portionof the twist for cutting co-operation in connection with the bit, andthe remainder of the spur will be completely housed within the recess inthe twist, the outer surface of the spur conforming to the shape of thetwist, and the upper end ofthe spur and the recess in the twistconforming with relation to each other for protecting the upper cuttingend of the s 111'.

In testimony whereof I aflix my signature.

STEPHEN D. STEADMAN.

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